Pelvic Girdle Joints

Question 1

Give the position and name the bones contributing to these joints:
Pubic symphysis
Sacroiliac joint

Answer 1

Pubic symphysis:
Bones: Most medial aspect of the pubic bones.
Position: Anterior articulation of pelvis.
Sacroiliac joint:
Bones: ilium and sacrum.
Position: Posterior articulation of the pelvis formed between the auricular surface of the ilium and the auricular surface of the ala of the sacrum.

Question 2

State the type of joint in each case:
Sacroiliac joint
Public symphysis

Answer 2

Sacroiliac joint: synovial plane joint. Fibrous posteriorly

Pubic symphysis: secondary cartilaginous joint.

Question 3

For the Pubic Symphysis only, describe the articular surfaces and their arrangement

Answer 3

Each bone is covered by a layer of hyaline cartilage and joined to the cartilage on the opposite side by a fibrocartilage disc (interpubic disc).

Question 4

For each joint name the ligaments which strengthen that joint:
Sacroiliac joint
Pubic symphysis

Answer 4

Pubic symphysis:
Superior pubic ligament
Arcuate pubic ligament
Interpubic disc

Sacroiliac joint:
Anterior & posterior sacroiliac ligaments
Interosseous sacroiliac Ligament.
Iliolumbar ligament 
Sacrotuberous Ligament
Sacrospinous Ligament